It was given to an employee of NASA that worked at the Shuttle Logistics Depot (NSLD) to "this commemorates the outstanding accomplishments you have made as an NSLD team member." The name on certificate has been covered with a piece of paper. It is signed by NASA JSC Orbiter Project Office.

The Flown Orbiter Endeavour Window section has a serial number "MC332-0006-0027" etched into it.

There are some problems with the certificate's text. Other than some grammatical and punctuation issues, STS-117 flew on Atlantis, not Endeavour, so it is not clear from what orbiter (and/or mission) this window sample was cut.

I picked it up with the intention of treating it as a research project...

NASAgoob

Congrats. A very nice piece - enjoy!

NASAgoob

Bummer - no one has one they want to sell. Keep me in mind. Thanks.

NASAgoob

I'm still interested in making the investment if anyone has one available. Please and thank you!